Our Science Nacuity Pharmaceuticals Glutamine drives glutathione synthesis and contributes to radiation sensitivity of A549 and H460 lung cancer cell lines ScienceDirect Glutathione You Are The Healer Glutathione, our master antioxidant, is built from cysteine, glycine, and glutamine. Low levels of these amino acids on testing may signal impaired production. Cysteine is key, with glycine close Glutamine: Metabolism and Immune Function, Supplementation and Clinical Translation